<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>basic</title>
    <!--<link rel="stylesheet" href="./test.css">-->
    <style>
        p{
            background-color: blue;
        }
    </style>
</head>
<body >

    <p style="background-color: black;">11111</p>
</body>
</html>